Oscillations in the stochastic gravitational wave background from sharp features and particle production during inflation

@article{Fumagalli2021OscillationsIT,
  title={Oscillations in the stochastic gravitational wave background from sharp features and particle production during inflation},
  author={Jacopo Fumagalli and S'ebastien Renaux-Petel and Lukas T. Witkowski},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2021},
  volume={2021}
}
We identify a characteristic pattern in the scalar-induced stochastic gravitational wave background from particle production during inflation. If particle production is sufficiently efficient, the scalar power spectrum exhibits 𝒪(1) oscillations periodic in k, characteristic of a sharp feature, with an exponentially enhanced envelope. We systematically study the properties of the induced spectrum of gravitational waves sourced after inflation and find that this inherits the periodic structure… 
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